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CCNA EIGRP LAB Question

January 25th, 2014 Go to comments

Question

After adding R3 router, no routing updates are being exchanged between R3 and the new location. All other inter connectivity and Internet access for the existing locations of the company are working properly.

The task is to identify the fault(s) and correct the router configuration to provide full connectivity between the routers.

Access to the router CLI can be gained by clicking on the appropriate host. All passwords on all routers are cisco.

IP addresses are listed in the chart below.

ccna_eigrp_sim

R1
Fa0/0: 192.168.77.33
S1/0: 198.0.18.6
S0/1: 192.168.60.25
S0/0: 192.168.36.13
R2
Fa0/0: 192.168.60.97
Fa0/1: 192.168.60.113
S0/0: 192.168.36.14
R3
Fa0/0: 192.168.77.34
Fa0/1: 192.168.60.65
Fa1/0: 192.168.60.81
R4
Fa0/0: 192.168.60.129
Fa0/1: 192.168.60.145
S0/1: 192.168.60.26

Answer and explanation

(Note: If you are not sure how EIGRP works, please read my EIGRP tutorial: http://www.9tut.com/eigrp-routing-protocol-tutorial. Note: You can download this sim to practice here: http://www.9tut.com/download/9tut.com_CCNA_EIGRP_sim_question.zip)

We should check the configuration of the new added router first because it does not function properly while others work well. From the command line interface of R3 router, enter the show running-config command

ccna_eigrp_sim_show_run

From the output above, we know that this router was wrongly configured with an autonomous number (AS) of 22. When the AS numbers among routers are mismatched, no adjacency is formed.

(You should check the AS numbers on other routers for sure)

To solve this problem, we simply re-configure router R3 with the following commands:

R3>enable (you have to enter cisco as its password here)

R3#configure terminal

R3(config)#no router eigrp 22

R3(config)#router eigrp 212

R3(config-router)#network 192.168.60.0

R3(config-router)#network 192.168.77.0

R3(config-router)#no auto-summary

R3(config-router)#end

R3#copy running-config startup-config

Check R1 router with the show running-config command:

ccna_eigrp_sim_show_run_2

Notice that it is missing a definition to the network R3. Therefore we have to add it so that it can recognize R3 router

R1>enable (you have to enter cisco as its password here)

R1#configure terminal

R1(config)#router eigrp 212

R1(config-router)#network 192.168.77.0

R1(config-router)#end

R1#copy running-config startup-config

Now the whole network will work well. You should check again with ping command from router R3 to other routers!

Modifications:

Maybe in this EIGRP Sim you will see the “passive-interface …” command somewhere in R1 configuration. If the link between R1 to R2; or R1 to R3; or R1 to R4) routers has the “passive interface” then we have to remove it with the “no passive-interface …” command because it prevents EIGRP update from being sent on that interface. But if the “passive interface” is applied to the link between R1 and ISP router like this:

R1:

!
router eigrp 212
passive-interface s1/0
!

then we just leave it. Don’t use the “no passive-interface s1/0″ on R1 because the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “ip default-network” command in R1 are correct so that all the routers (R1, R2, R3, R4) can access the Internet.

(Note: The “ip default-network” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too). In the exam you will see these lines in R1 configuration:

!
ip default-network 198.0.18.0
ip route 0.0.0.0 0.0.0.0 198.0.18.5
!

If you want to learn more about “ip default-network” command please read: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094374.shtml

I read recent comments and realized that you will see the “passive-interface” in the link between R1 & ISP router so just leave it.

Note: Also some readers confuse about if we should use the wildcard masks on the “network” statements under EIGRP process or not. For example should we use:

router eigrp 212
network 192.168.77.0 0.0.0.3

The answer is: we can use wildcard masks or not, it does not matter. Not having a wildcard mask does not make the routes conflicting. The “network …” command in EIGRP (and OSPF, RIP) does not means “advertise this network” but means “If I has interface(s) belongs to this network please turn on EIGRP on that interface. Therefore when you don’t use wildcard mask EIGRP will turn on EIGRP on all interfaces that belongs to the network you specify in the “network …” command.

You should only use wildcard mask on EIGRP if you have 2 or more interfaces that belong to the same major networks but you don’t want to run EIGRP on all of them. For example if your router has 2 interfaces whose IP addresses are 192.168.30.1/28 and 192.168.30.17/28 but you only want to run EIGRP on the first interface, you can type “network 192.168.30.0 0.0.0.15″ under EIGRP process.

Other lab-sims on this site:

CCNA Access List Sim

CCNA NAT SIM Question 1

CCNA NAT SIM Question 2

CCNA Frame Relay Sim

CCNA Configuration SIM Question (RIPv2 SIM)

CCNA VTP SIM

CCNA Drag and Drop SIM

CCNA Implementation SIM

 

Comments
Comment pages
1 2 3 4 5 6 77 29
  1. Mai
    April 26th, 2011

    @jambo: the other 3 networks are already config. so we don’t have to write them again.When u write the command of sh running-config on R1, u found there are only 3 networks and there is a missing network so u just add it.

  2. Archee
    April 27th, 2011

    I`am fail exam. Two labs – ACL and eigrp. In lab with eigrp, example 2 – i do all that explain here, but it dosen`t work – I didn`t see the network 192.168.77.0 in running-config. What is wrong?

  3. Jimson
    April 27th, 2011

    i failed the exam, i got the eigrp, acl2, and vtp sims. when i retake the test am i likely to get the same sims or will cisco switch them on me?

  4. olu_galaxy
    April 28th, 2011

    @ Jimson sorry, failure is not the end. I believe you can make again.

    Apart from the stimulation, are other questions valid from the dumps.

  5. Jimson
    April 28th, 2011

    I have not looked at the dumps.

  6. satish
    April 29th, 2011

    I need latest dumps were to get

  7. satish
    April 29th, 2011

    I need the link pls

  8. CCNA EIGRP LAB Question
    April 30th, 2011

    Hi,

    I did everything you say on your explanation but when I ping router 2 it did not work.
    Try to go on it and global config was disabled.

    It learned about some routes from router 1 but did not have all.

    When I check the running config of r2 it did not have any network statements after eigrp 212.

    Any ideas of what should I do?

    leoaraujo79@gmail.com

  9. Doc
    May 4th, 2011

    leoaraujo79, your problem is that you need to either remove a wrong route and/or add a missing route on the main router -> R1. This is the problem I had last week in the exam and run out of time trying to sort this small thing. To ping successfully you must see all networks on the show ip route listed under D-eigrp. That is all. See my comments on the VTP lab page as well.

  10. Hunterskill
    May 6th, 2011

    @Doc , what is the best method to remove a wrong route from the maon router ?
    It might be a daft question , but here we go ..
    Thx

  11. Doc
    May 6th, 2011

    @Hunterskil, not at all.. I try to explain as was for me..

    the question will tell you that a new router was added but something is wrong. So R1 will remain the main router anyway and this new router connects to it. Ignore the statement that “all other configuration on other routers has been done correctly” as it is that specific statement that made me not realize in time that they had deliberately cooked up the main router eigrp routes. Them liars. So the interface connected to your new router if in say subnet 192.168.44.0, on R1 they will put an entry “network 198.168.52.0″ when network 198.168.52.0 doesn’t exist. On the new router that network was .44 and not .52 => so you have option to just add the .44 and it works but remember question also says “correct the problem” so:

    R1# router eigrp 23
    R1#no network 192.168.52.0
    R1#network 192.168.44.0

    In other words the network command must be followed by an entry of an “existing” subnet.. not imaginary or not mentioned anywhere..

  12. Hunterskill
    May 6th, 2011

    @ Doc , thx that makes sense to me now
    However , I think u need to add:
    no auto-summary , I guess at the end before saving the new config …

  13. Amit
    May 6th, 2011

    @NAD

    Hi
    i am going to appear in 2days,
    pls let me know do we need to remove passive interface command by adding “NO’
    or should we ignore that

    pla its urgent

  14. Doc
    May 6th, 2011

    @ Hunterskill, on R1 it is not necessary as it will be probably present. You didn’t delete AS=23 on this router. On the other router, that you 1st delete AS, create AS again, then you add that entry since you will have deleted it with AS.

  15. natalie
    May 8th, 2011

    hi all,

    which dump is valid, please ?

    thanks.

  16. hassen
    May 9th, 2011

    ALLHAMDULILAH I PASS CCNA EXAM TO DAY IN ETHIOPIA I SCORE 881 PLS READ MOER IPV6,
    FRAME RELAY AND ACCESS LIST THE SIM ARE SAME BUT IN EIGRP PASSIVE INTERFACE
    THE REST ARE SAME GOODLUK TO ALL EXAMINER THANKS TO ALL BY HELPING ME DUMPING Z LATEST EXAM AND GIVING INFORMATION

  17. yo
    May 10th, 2011

    i will took my exam in 30 minutes, i hope pass the test with this page, acme, test king and ccna library certification.
    i will reply if this page work for me

  18. Sk
    May 12th, 2011

    Hi first of all many thanks to 9tut.com & careercert.info … cleared CCNA today got 900/1000 …got EIGRP, ACL2 and VTP i studied Actual Test 640-802 v4.2_Q647 …. Few questions were tricky so better understand concepts before appearing to exam ….. All the best to all … moving to CCNP :) ….

  19. rickirick
    May 12th, 2011

    Took my certification exam a couple hours ago and it was a hard one. I passed with 907. The labs (Eigrp, access list 2 and vtp) are the same except for a few changes in the access list questions. They ask you to deny a few more networks but its actually the same statements you use to do it. The eigrp lab sim is the same, save for a few changes with the IP addresses and AS number. Nothing changes in the VTP lab sim. Just get your hand on the Testinside 21.14 (google it) and you’ll be able to pass this exam.

  20. Mohamed nour,Egypt
    May 14th, 2011

    I passed the exam today with 907/1000 , It was 53 question .EGRP the first question , three drag and drop, VTP, ACL2 was the question no48. when i had only 25 minutes.it takes 15 minutes to do it.there were 7-9 questions out of the dump,but you can do it.

  21. z7
    May 16th, 2011

    passed today in Los Angeles with an 881. vtp, eigrp & acl2. like many others used lammle 6th edition, mashti, 9tut sims to study. thank you 9tut, you rock dude!

  22. Mike
    May 16th, 2011

    took my exams today and scored 696….got 100 percent in the access-list sim but scored 0 in eigrp because i didnt remember to save my config. also i messed up my vtp sim. there were up to 18 new questions not available in dumps. i will be retaking the exam in 5 days time.
    Mike

  23. June
    May 17th, 2011

    Hey guys..

    In the eigrp question above to make the lab work I we need to make 2 changes
    1) fix the incorrect AS on R3
    2) add network 192.168.77.0 on R1
    Now what I m not sure is –
    why or how is network -192.168.32.0 present/configured on R1 ? Should it be removed ?

    Please correct if I’m wrong

    Thanks!

  24. June
    May 20th, 2011

    ignore my post above I got the answer…

  25. walex
    May 20th, 2011
  26. Mik
    May 22nd, 2011

    Hi i know that some important changes have been inserted in the exam for this lab (EIGRP)

    Have you more details about that? Thx. Mik

  27. Jeitico
    May 22nd, 2011

    Could someone send me the lates dumps please Jeitico@hotmail.com

  28. sbt
    May 24th, 2011

    hi
    For EIGRP new sim question, pls let me know do we need to remove passive interface command by adding “NO’ or should we ignore that. If we add NO, will be do it passive again after adding new network?
    Please quick response…

  29. shakeel
    May 24th, 2011

    i need a latest valid dumps pls send at giant1968@hotmail.com

  30. 9tut
    May 25th, 2011

    @sbt: If the link between the 2 routers has the “passive interface” then we have to remove it because it prevents EIGRP update from being sent on that interface. If the “passive interface” is applied to the link between a host and a router then we should ignore it.

  31. bhanu
    May 25th, 2011

    Hi ,i have completed ccna and i want to do ccnp pls let me know if any body know which simulator ,books will be useful for this.

  32. Anonymous
    May 25th, 2011

    pls send new dump
    sergejcc@yahoo.fr

  33. sbt
    May 26th, 2011

    Thanks 9tut :)

  34. se92
    May 26th, 2011

    Hi guys, ACME is not valid anymore..many many new questions are out. Learn your concepts! even with ACME,Ti and 9tut I got 766 only. :-(

  35. alex
    May 28th, 2011

    Why “Internet access is working properly”?

    computers can’t ping ISP router. And there is no commands for configure it.

    Is it correct?

  36. kas
    May 30th, 2011

    I messedupon the EIGRP question because of the “missing Defenition”. But next time i will show the paper.

  37. Deepak.R
    May 30th, 2011

    @ 9tut

    if we find passive interface under eigrp you said to remove it by using the command no passive-interface but in which step we have to use it

  38. 9tut
    May 30th, 2011

    @Deepak.R: You can remove it in any step you want. When you complete the configuration, try pinging from R1, R2,R3, R4 to other interfaces to make sure it works well. If not, check if the configuration has the “passive-interface” or not -> remove if it exists.

  39. wayne
    May 30th, 2011

    Can someone kindly send me the latest dumps for CCNA 802 exam to cts1234586@hotmail.com
    Many Thanks

  40. Deepak.R
    May 30th, 2011

    @9tut

    so iam gonna use this command “no passive interface” after configure terminal of R3 i.e

    R3>enable
    R3#configure terminal
    R3#no passive interface
    R3(config)#no router eigrp 22
    R3(config)#router eigrp 212
    R3(config-router)#network 192.168.60.0
    R3(config-router)#network 192.168.77.0
    R3(config-router)#no auto-summary
    R3(config-router)#end
    R3#copy running-config startup-config

    iam i writ or wrong sir…

  41. ahmed
    June 1st, 2011

    hi 9tut
    any chang in the sim i have exam tommorw plz reply for me important. thanks

  42. 9tut
    June 1st, 2011

    @Deepak.R:
    If the “passive-interface” is inside R3 and R3 has a wrong AS number then we just need to “no router eigrp 22″, the “passive-interface” command inside will be automatically removed.

    The correct configuration should be:
    R3>enable
    R3#configure terminal
    R3(config)#no router eigrp 22
    R3(config)#router eigrp 212
    R3(config-router)#network 192.168.60.0
    R3(config-router)#network 192.168.77.0
    R3(config-router)#no auto-summary
    R3(config-router)#end
    R3#copy running-config startup-config

    If the “passive-interface” is in the link between R1 and R3 (or R2, R4) then we have to do like this:

    R1#configure terminal
    R1(config)#router eigrp 212
    R1(config-router)# no passive-interface fa0/0

    But I read all the comments related about this “passive-interface” problem and realized that the “passive-interface” is between R1 and ISP. In this case just leave it, don’t use the “no passive-interface s1/0″ on R1 as the link between R1 & ISP doesn’t need EIGRP to run on it. A static route from R1 to ISP & “default-information originate” command in R1 are the correct answers.
    Note: The “default-information originate” command in R1 will advertise the static route of R1 (to go to the Internet) to other routers (R2,R3,R4) so that they can access the Internet too.

    If you have any question, please don’t hesitate to ask!

  43. N0enable
    June 1st, 2011

    @9tut:
    Can you provide example config how to apply static route and default-info originate on R1?

  44. Mohammd Idrees
    June 2nd, 2011

    Sir, Eigrp question has been changed , so kindly uplaod new question , simulation is same but questions are different

  45. Memo
    June 2nd, 2011

    I have this Sim in my exam but they asked me to allow hosts to use the internet
    can anyone explain how i do that

  46. Nexus420
    June 2nd, 2011

    Hey Guys. Excellent website. I gotta thank the people the post out here as well.

    I took the test Jun 1st 2011 and scored 894….

    I used this site and test inside (make sure is not that old).

    LABS: VTP, EIGRP, ACL

    On the ACL LAB the request to deny all users for all access to web server is requested.

    access list 101 permit tcp host (host ID) host (server IP) eq 80
    access list 101 deny IP any host (server IP)
    access list 101 permit IP any any

    Interface fast 0/1
    ip access-group 101 out

    Next stop CCDA.

    Cheers from Costa Rica….

  47. renu
    June 3rd, 2011

    @nexus, congrats and gud luck for CCDA!! In eigrp lab have u been asked to configure NAT as well? Tel me more about the labs….

  48. N0enable
    June 3rd, 2011

    @9tut
    Can you clarify about default-information originate?

    RIP & OSPF uses default-information originate
    EIGRP use redistribute static

    thax

  49. GURUPRASAD from India
    June 3rd, 2011

    Hi Everyone,
    Here you go the link of dumps
    So it useful for exam
    From these 3 dumps u get definetly 100% and also look into the Hotspot of 9tut questions and Simulations.
    http://www.4shared.com/get/O2yJIKud/TIS_640-802_v2124_436Q.html
    http://www.examcollection.com/cisco/Cisco.acme.640-802.v2011-04-20.356q.vce.file.html (from 1st and 2nd u may get 70% of Questions for Exam)
    and
    http://www.4shared.com/document/JfUv-P4w/TK_640-802_v218_New_Question_a.html (remaining 30% u get from this new version update TestInside 218) and don’t forget look into 9tut simulation and hotspot
    Sorry i can’t mail everyone into individual
    So i update in 9tut and Exam collection and it will use for all
    Note:
    Dont worry about commands you can use short commands in CLI (command line interface) as shown below:
    1. Show mac address-table you can write in short show mac + tab it will appear full command (and please be noted don’t use show mac-address-table use only show mac address-table(don’t use ‘-‘ between mac and address, because the reason is, In new switches don’t use show mac-address-table it will commanded as show mac address-table keep it in mind this one(The command show mac address-table will display the forward/filter table, also called a CAM table on a switch))
    2. Show running-config you can use as show run
    3. Copy running-config startup-config you can use as copy run start
    4. And more short command you can use CLI
    5. In EIGRP don’t forget to add no-auto summary that to new added router because The network considered a discontiguous network because you have one classful address subnetted and separated by another classful address. Only RIPv2, OSPF, and EIGRP can work with discontiguous networks, but RIPv2 and EIGRP won’t work by default. You must use the no auto-summary command under the routing protocol configuration.
    6. And don’t forget to ping to all routers when u doing lab in EIGRP and ACL don’t forget to ping and web browser to check okay
    Please understand the concept and take exam when u read each question understand why this is the answer that one you know.
    And Be carefull in Switching means you get one question which is root, designated by four switch mac address least mac-address will be the root bridge that port is connect to other switch. The root bridge receiving from other port that is root and second lower mac address is designated to other switch but not to root bridge.
    Thank u 9tut and Exam collection
    Any Regard Query or Question
    Update comments in the 9tut or examcollection comments.

  50. 9tut
    June 3rd, 2011

    @N0enable: Yes, I forgot it is running EIGRP so you will not see the “default-information originate” in the configuration. Maybe we will see the “redistribute static” command there but just ignore it.

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